TIME(1)
NAME
time − time a command
USAGE
time command
DESCRIPTION
If you specify time along with a particular command, the command first executes and then time prints the following information: 1) elapsed time during the command, 2) time spent in the system, and 3) time spent executing the command. Times are reported in seconds, and printed on the diagnostic output stream.
Time is a built-in command to csh (1), with a much different syntax. This command is available as /bin/time to csh users.
CAUTIONS
Elapsed time is accurate to the second, while the CPU times are measured to the 100th second. Thus, the sum of the CPU times can be up to a second larger than the elapsed time.